ISHS Acta Horticulturae 559: V International Symposium on Protected Cultivation in Mild Winter Climates: Current Trends for Suistainable Technologies
HIGH TEMPERATURE EFFECT ON TOMATO PREDISPOSITION TO TSWV |
| Authors: | M. Mitidieri, E. Biderbost, P. Castellano, E. Taleisnik |
| Keywords: | Heat shock, virus, salicylic acid |
| DOI: | 10.17660/ActaHortic.2001.559.116 |
| Abstract:
Tomato spotted wilt is a major disease affecting greenhouse cultivated tomato. Several environmental and plant factors can affect the severity of this disease, among them high temperatures. Salicylic acid participates in the physiological mechanisms leading to disease symptom expression, and high temperatures can modify its accumulation. The purpose of this work was to determine whether the exposure of tomato seedlings to high temperatures, prior to infection, affects their response to TSWV, and if salicylic acid treatments can revert the heat stress effects. Tests were run in two tomato hybrids: one susceptible and the other carrying gene Sw5, resistant to TSWV. High temperature prior to mechanical inoculation increased the severity of TSWV infections. In the susceptible cultivar, more severe symptoms were observed when plants were stressed before inoculation, and yield was lower. In inoculated folioles of the resistant cultivar, heat stress increased the number of local lesions and absorbance values of ELISA tests. Exogenous salicylic acid applications to the susceptible cultivar prior to inoculation, resulted in less severe symptoms in non-heated plants. Salicylic acid caused a reduction in virus titer at the beginning of infection in heated plants, suggesting it is involved in the response of heat-stressed tomato plants to TSWV infections. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
